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Finding the Fourth Proportional to 21,828.80, 32,756.70 and 8,679.80

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Solution

The fourth proportional to 21,828.80, 32,756.70 and 8,679.80 is: 13,025.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,828.80 : 32,756.70 = 8,679.80 : x
  2. Step 2: Convert to fraction form
    21,828.80/32,756.70 = 8,679.80/x
  3. Step 3: Cross multiply
    21,828.80x = 32,756.70 × 8,679.80
  4. Step 4: Simplify right side
    21,828.80x = 284,321,604.66
  5. Step 5: Solve for x
    x = 284,321,604.66/21,828.80
  6. Step 6: Final answer
    x = 13,025.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.